Build infra: distcc recipe (CT108 + tesla) for kernel + userspace

README.md

@@ -181,6 +181,45 @@ HEVC once the stretch goal is viable.
 Patches upstreamed along the way (v4l2-request to FFmpeg, VDPU346 to
 linux-media) count double — they benefit the whole fleet.
 
+## Build infrastructure
+
+Fourier touches two kinds of builds: userspace (FFmpeg + patches, GStreamer,
+libva-v4l2-request) and kernel (DT + module compiles if we carry out-of-tree
+rkvdec2 / VDPU346). Both benefit from distcc — CT108 (14-core aarch64 on
+data, wake via `wake-data` on hertz) plus always-on tesla on hertz.
+
+Zeroconf is broken in containers — hand-wire `DISTCC_HOSTS`.
+
+### Kernel / DT modules (cross-build from x86 host)
+
+```sh
+DISTCC_HOSTS="localhost/4 192.168.88.208:3632/14,lzo,cpp tesla.lxd:3632/4,lzo,cpp" \
+  pump make -j80 O=build/ ARCH=arm64 \
+  CROSS_COMPILE='distcc aarch64-linux-gnu-' HOSTCC='ccache gcc'
+```
+
+Pump mode sometimes misbehaves on aarch64 cross builds — fall back to plain
+`make -j80` without `pump` if include-server throws.
+
+### FFmpeg / userspace (native aarch64 host — ohm, ampere, fermi build CT)
+
+```sh
+export DISTCC_HOSTS="localhost/4 192.168.88.208:3632/14,lzo,cpp tesla.lxd:3632/4,lzo,cpp"
+export MAKEFLAGS="-j80"
+makepkg -s                    # AUR / marfrit-packages workflow
+# or, from raw tree:
+./configure && pump make -j80
+```
+
+`makepkg` honours `MAKEFLAGS` but not `DISTCC_HOSTS` for all build hooks —
+put `DISTCC_HOSTS` in `/etc/makepkg.conf` or export before invocation. CC/CXX
+wrappers: `/usr/lib/distcc/` symlinks on native aarch64 (NOT
+`/usr/lib/distcc/bin/`).
+
+Remember to re-run `wake-data` if CT108 is asleep — see `his` skill or the
+`project_distcc_infra.md` memory for the full recipe. When that memory and
+this README diverge, fix both.
+
 ## Packaging — marfrit-packages
 
 New fleet hosts should get Fourier userspace via `pacman -S` / `apt install`,